Feed-roll for leather-skiving machines, &amp;c.



No. 887,625. PATENTED MAY 12, 1908. E. P. GRANT. FEED ROLL FOB. LEATHER SKIVING MACHINES, &u

APPLICATION FILED JUNE 24. 1907.

UNITED STATES PATENT I OFFICE.

REUBEN P. GRANT, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO BEOKWITH BOX TOE COM- PANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

FEED-ROLL FOR LEATHER-SKIVING MACHINES, 800.

.To all whom it may concern:

Beit known that I, REUBEN P. GRANT, of Boston, inthe county of Suffolk and State of Massachusetts, have invented certain new a and useful Improvements in Feed-Rolls for Leather-Skiving Machines, &c., of'which the following is a specification.

This invention relates particularly to machines for skiving-box-toe blanks, and as here shown is embodied in a machine, the essential parts of which are a splittin knife and a pair of feed rolls, the nip of w iich is arranged to present the leather to be skived to the edge of the splitting knife, the bed roll having a depression in its periphery corresponding in contour to the skived blank to be. roduced, and constituting a matrix, whi e thecompanion or pressure roll is arranged to press a sheet of leather against the bed roll, and cause it to conform closely to the matrix, the action of the machine being to produce a blahk which conforms accurately tothe shape of the matrix, the portion of the leather which constitutes the blank,

sinking into the matrix under the action of the pressure roll, so that all portions of the sheet that are not ressed into the matrix, are cut away in the 01111 of a skiving, leaving a blank which is perfectly skived around its entire margin.

The invention has for its object to provide an improved construction of pressure roll adapted to cause that portion of the material which constitutes the skived blank, to conform accurately to the matrix, and to feed the material positively, without liability of slippage of the pressure roll on to the material.

The invention consists in the improvements which I will now proceed to describe and claim.

Of the accompanying drawings forming a part of this specification,-Figure 1 represents a sectional view of a portion of a skiw ing machine embodying my invention. Fig. 2 represents a view similar to a portion of Fig. 1, illustrating a different stage of the skiving operation. Fig. 3 represents a sectional view of the completed skived blank.

'50 Fig. 4 represents a view of a portion of the pressure roll, part of said view being in sec tion on line 44 of Fig. 1. Figs. 5 and 6 represent perspective views of the sections hich form the face of the pressure roll.

Specification of Letters Patent.

Application filed June .24, 1907.

Patented May 12, 1908.

Serial No. 380,566.

The same letters of reference indicate the same parts in all the figures- In the drawings 0 represents a leather splitting knife, which may be of any suitable character, and may be either fixed, or n1ov.

able as a band knife, the knife being here sheet of leather or other material e into the matrix, and in forcing the sheet 6 edgewise against the splittin knife, has an acting face or periphery, whic in this embodiment of my invention, is formed by a series of ri id collars If and a series of compressible, pre erablye astic, collars g, said collars g and g alternating with .each other, an eing 0r shaft h,

mounted upon a cylindrical bod? which is preferably tubular, an( constitutes a hub adapted to be mounted on a fixed journal. The sections f, which are composed of any suitable metal, are provided with shar -pointed teeth or serrations f, forming the perimeters of the sections, said sections being ri idly affixed to the body h by means of a .spdine i engagin corresponding grooves or seats formed in the exterior of the body 71 and in the inner edges of the sections f.

The sections 9, which are preferably composed of vulcanized rubber having a considerable degree of elasticity, are interposed between the sections f, and their perimeters are normally flush with the points of the teeth f so that the points of the teeth and the perimeters of the sections 9 bear simultaneously on one side of the sheet e. The

two rolls are so arranged relatively to the splitting knife that they nip the sheet e, and present it to the edge of the knife in the direction required to cause the skiving action. The said rolls are so spaced apart that when the matrix d is wholly at one side of the nip of the rolls, as shown in F ig. 2, the teeth f will indent one side of the sheet 0 somewhat deeply, as shown in Fig. 2, the corres onding portions of the elastic sections 9 yie ding,

and being compressed by the sheet .2, and at the same time maintaining a feeding engagement with the sheet, V v/ hen the matrix is brought by the rotation of the bed rollinto the nip of the rolls, shown in l, the side of the sheet bearing on the bed roll is pressed by the conjoint action of the serrated sections and the elastic sections into the matrix, the elastic sections expanding and aiding materially in pressing one sideof the sheet into close contact with the surface of the matrix, the yielding sections at the same time maintaining their feeding engagement. it will be seen by reference to Fig. 1 that while the deeper portions oi the matrix are in the nips ofthe rolls, the depth of penetration of the ooposite side of the sheet by the teeth f is less than when the matrix is wholly at one side or the nip oi the roll. My improved roll is therefore cl'laracterized by the fact the-tits acting iace is formed by the 'perimeters of alternating rigid and corn pressed sections which simultaneously exert a feeding action on the material, the (50111- pressible' sections also acting to force one side oi the material against the face of the matrix. An effective feeding engagement is therefore constantly maintained between the feed roll and the material being fed, there being no non-rotating parts in the spaces between the serrated sections l-lzretofore in skiving machines ()1. this character, the feed roll provided with serrated sections spaced apart, has been accompanied by non-rotating spring-pressed arms or fingers projecting into the spaces between the serrated sections, and bearing yieldingly on one side of the material. These "lingers, however, do not partake of the rotary movement of the feed roll and they therefore exert a frictional drag on the material, which is not the case with the elastic sections g of my improved. feed roll.

The relative thiclmessot the sections and 9 may be varied, the section g being considerably thicker, if desired, than the sections In assembling the sections on the bodyh, the elastic sections may be subjected to cornpressive pressure which will cause them to bulge laterally into the spaces between theteeth of the ri id sections thereb increasin vthe area of feeding surface afforded by the the skiving .9 oil from the teeth f as the ing passes from the nip of the rolls, this i361 material of the said sections.

The skived blank c passes. atthe opposite side of the knife, as shown in Big. 1.

My improved feedroll is not limited to use in connection with Xsplitting knife and a set forth its characteristics are particularly adapted for use in connection with said parts.

1 claim: I 1. A feed roll the facez-of which is formed by the perimeters of alternating rigid and elastic sections the rigid sections being serrated to engage the material being fed, and:

the elastic sections adapted to be cornpressed by said ni'aterial.

2. A. feed roll the face of 111011 is formed by alternating rigid and elastic sections, the rigid sections being serrated, and the elastic sections normally substantially flush with the points of the serrations.

3. A feed roll comprising a supporting body, a series of spaced rigid serrated sec- ,tions affixed to the body, and a series of elastic sections alternating with the rigid sections.

l, in combination, a bed roll, and stood roll opposed to the bed roll. and having a face formed by the perimeters of alternating ng accomplished; by the expansion of the bed roll having a matrix, althoughas above rigid and elastic sections, the rigid sections being serrated, and the elastic sections normally substantially flush with the points of the serrations.

5. combination, a bed roll having ,a matrix in its periphery, a feed. roll opposed to the bed roll and having a face formed by the perimeters of alternating rigid and elastic sections, the rigid sections being serrated, and the elastic sections normally substantially flush with the points of the serrations, and a splitting knife arranged to cooperate with said rolls.

in testimony whereof I have alliXed my signature, in presence of two witnesses.

REUBEN P. GRANT. V'Vitnesses C. F. BnowN, P. W. Pnzzn'r'rr. 

